Comment 3 for bug 1710938

> because it pulls *all* containers into the local registry (it takes 30 minutes).

If we have an infra cache available, would it be quicker to *not* pull the images to the undercloud registry, and just pull them (once) to the subnode we're testing?

For single node tests I'm not sure we gain anything by using the undercloud cache, as we end up copying the same images to two nodes, and these copies are serialized (container upload, and the pull we do during the deploy?)